public class demo7 {
    public static void main(String[] args) {
        Thread t = new Thread(() -> {
            System.out.println("hello");
        });

        t.start();

        try{
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println(t.isAlive());
    }
}
